Reading-light Color Effect on Intraocular Pressure a pilot study

Reading-light Color Effect on Intraocular Pressure a pilot study | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Reading-light Color Effect on Intraocular Pressure a pilot study Tun-Hao Chen, Pei-Chung Tsai, Dipanshu Sharma, Yu-Lun Hsiao, Bo-Hsun Peng, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4860933/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Purpose: This study aimed to investigate the effect of reading-light color on intraocular pressure (IOP) and its fluctuation in the dominant and auxiliary eyes. Design: Correlational research and analysis. Subjects: Fourteen subjects, aged 20 to 25 years, with a diopter ranging from 0 to -8D, were included. Method : Subjects were instructed to read a book with a 12-pt text under white light (5,500 K) and candlelight (1,700 K), separately, for 90 minutes. Their intraocular pressures (IOPs) under their own readable brightness were measured by using a tonometer (NIDEK NT-530P) every 30 minutes. The readable brightness, reading-light spectrum and the corresponding maximum permissible exposure-limit (MPE) were measured using a blue-hazard quantitative spectrometer (SRI-100). Main Outcome Measure: IOP of subjects after reading books under white light and candlelight for 90 minutes. Results: Colors of reading light indeed had profound effects on IOP, and their effects were very different for the dominant and auxiliary eyes. Under white light, the IOP in the dominant eye barely increased ( P =0.6), but fluctuated significantly with the increase in reading time ( P =0.04). In contrary, in the auxiliary eye, it did not fluctuate ( P =0.28). Instead, it slowly increased with time ( P =0.01, r=0.982). Under candlelight, the IOP also fluctuated in the dominant eye, but to a less significant extent ( P =0.045). Moreover, in the auxiliary eye, it did not increase, but gradually decreased with the increase in reading time ( P =0.001, r=-0.997). Furthermore, myopic diopter showed effects on the IOPs of both dominant and auxiliary eyes. In general, the IOP increased with the increase in myopic diopter. For subjects with mild or moderate myopia, the IOP in the dominant eye, either under white or candlelight, barely increased as the reading time increased, indicating a better IOP adjusting ability. As to the subjects with high myopia, their IOP increased with the increase in reading time, with a P value of 0.08 under white light and 0.05 under candlelight. Conclusion: Different reading-light colors showed significantly different effects on IOP. Reading under blue-emission-free candlelight can effectively prevent the increase in IOP and reduce its fluctuation. Myopic diopter showed effects on the IOPs of both dominant and auxiliary eyes. In general, the IOP increased with the increase in myopic diopter. Clinical trial registration: 110-136-F, 28-March-2023 Health sciences/Medical research/Study design Health sciences/Medical research/Study design/Clinical trials Physical sciences/Optics and photonics/Lasers leds and light sources Reading-light color Intraocular pressure Myopic diopter Reading illuminance Full Text Additional Declarations No competing interests reported. Supplementary Files Supplementarylightcolor.docx Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4860933","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":341586389,"identity":"3d360485-2dd2-4d1d-834f-f0d68f96362c","order_by":0,"name":"Tun-Hao Chen","email":"","orcid":"","institution":"National Tsing Hua University","correspondingAuthor":false,"prefix":"","firstName":"Tun-Hao","middleName":"","lastName":"Chen","suffix":""},{"id":341586390,"identity":"8d3aa1d6-768e-4f6b-9528-c04267f32ba4","order_by":1,"name":"Pei-Chung Tsai","email":"","orcid":"","institution":"National Tsing Hua 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illuminance","lastPublishedDoi":"10.21203/rs.3.rs-4860933/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-4860933/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003e\u003cem\u003ePurpose:\u003c/em\u003e This study aimed to investigate the effect of reading-light color on intraocular pressure (IOP) and its fluctuation in the dominant and auxiliary eyes.\u003c/p\u003e\n\u003cp\u003e\u003cem\u003eDesign: \u003c/em\u003eCorrelational research and analysis.\u003c/p\u003e\n\u003cp\u003e\u003cem\u003eSubjects: \u003c/em\u003eFourteen subjects, aged 20 to 25 years, with a diopter ranging from 0 to -8D, were included.\u003c/p\u003e\n\u003cp\u003e\u003cem\u003eMethod\u003c/em\u003e: Subjects were instructed to read a book with a 12-pt text under white light (5,500 K) and candlelight (1,700 K), separately, for 90 minutes. Their intraocular pressures (IOPs) under their own readable brightness were measured by using a tonometer (NIDEK NT-530P) every 30 minutes. The readable brightness, reading-light spectrum and the corresponding maximum permissible exposure-limit (MPE) were measured using a blue-hazard quantitative spectrometer (SRI-100).\u003c/p\u003e\n\u003cp\u003e\u003cem\u003eMain Outcome Measure: \u003c/em\u003eIOP of subjects after reading books under white light and candlelight for 90 minutes.\u003c/p\u003e\n\u003cp\u003e\u003cem\u003eResults:\u003c/em\u003e Colors of reading light indeed had profound effects on IOP, and their effects were very different for the dominant and auxiliary eyes. Under white light, the IOP in the dominant eye barely increased (\u003cem\u003eP\u003c/em\u003e=0.6), but fluctuated significantly with the increase in reading time (\u003cem\u003eP\u003c/em\u003e=0.04). In contrary, in the auxiliary eye, it did not fluctuate (\u003cem\u003eP\u003c/em\u003e=0.28). Instead, it slowly increased with time (\u003cem\u003eP\u003c/em\u003e=0.01, r=0.982).\u003c/p\u003e\n\u003cp\u003eUnder candlelight, the IOP also fluctuated in the dominant eye, but to a less significant extent (\u003cem\u003eP\u003c/em\u003e=0.045). Moreover, in the auxiliary eye, it did not increase, but gradually decreased with the increase in reading time (\u003cem\u003eP\u003c/em\u003e=0.001, r=-0.997).\u003c/p\u003e\n\u003cp\u003eFurthermore, myopic diopter showed effects on the IOPs of both dominant and auxiliary eyes. In general, the IOP increased with the increase in myopic diopter. For subjects with mild or moderate myopia, the IOP in the dominant eye, either under white or candlelight, barely increased as the reading time increased, indicating a better IOP adjusting ability. As to the subjects with high myopia, their IOP increased with the increase in reading time, with a P value of 0.08 under white light and 0.05 under candlelight.\u003c/p\u003e\n\u003cp\u003e\u003cem\u003eConclusion:\u003c/em\u003e Different reading-light colors showed significantly different effects on IOP. Reading under blue-emission-free candlelight can effectively prevent the increase in IOP and reduce its fluctuation. Myopic diopter showed effects on the IOPs of both dominant and auxiliary eyes. In general, the IOP increased with the increase in myopic diopter.\u003c/p\u003e\n\u003cp\u003eClinical trial registration: 110-136-F, 28-March-2023\u003c/p\u003e","manuscriptTitle":"Reading-light Color Effect on Intraocular Pressure a pilot study","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2024-09-03 20:28:16","doi":"10.21203/rs.3.rs-4860933/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"9454125d-a3ce-4872-8ca5-4a52bc063519","owner":[],"postedDate":"September 3rd, 2024","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[{"id":36193891,"name":"Health sciences/Medical research/Study design"},{"id":36193892,"name":"Health sciences/Medical research/Study design/Clinical trials"},{"id":36193893,"name":"Physical sciences/Optics and photonics/Lasers leds and light sources"}],"tags":[],"updatedAt":"2025-05-26T06:09:51+00:00","versionOfRecord":[],"versionCreatedAt":"2024-09-03 20:28:16","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-4860933","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-4860933","identity":"rs-4860933","version":["v1"]},"buildId":"qtupq5eGEP_6zYnWcrvyt","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}